Uni-ball Air Rollerball Pen. Here’s a description based on the images:

Uni-ball Air Rollerball Pen (Micro 0.5mm)

• Ink Color: Black
• Barrel Color: Varied, with options like orange and pink accents.
• Tip Size: 0.5mm (Micro), offering precise and controlled writing.
• Ink Type: Uni Super Ink, which is waterproof and resistant to fading.
• Flow System: Equipped with the Uni-Flow system, ensuring smooth and consistent ink flow.
• Usage: Suitable for everyday writing tasks, providing a sensitive and comfortable writing experience with rollerball technology.
• Brand: Manufactured by Mitsubishi Pencil under the Uni-ball series.